21. =The Vengeance of Suetonius.=--Suetonius was no mean general, and he hastened back to the scene of destruction. He called on the commander of the legion at Isca Silurum to come to his help. Cowardice was rare in a Roman army, but this officer was so unnerved by terror that he refused to obey the orders of his general, and Suetonius had to march without him. He won a decisive victory at some unknown spot, probably not far from Camulodunum, and 80,000 Britons are reported to have been slain by the triumphant soldiery. Boadicea committed suicide by poison. The commander of the legion at Isca Silurum also put an end to his own life, in order to escape the punishment which he deserved. Suetonius had restored the Roman authority in Britain, but it was to his failure to control his subordinates that the insurrection had been due, and he was therefore promptly recalled by the Emperor Nero. From that time no more is heard of the injustice of the Roman government. 22. =Agricola in Britain.= =78--84.=--Agricola, who arrived as governor in =78=, took care to deal fairly with all sorts of men, and to make the natives thoroughly satisfied with his rule. He completed the conquest of the country afterwards known as Wales, and thereby pushed the western frontier of Roman Britain to the sea. Yet from the fact that he found it necessary still to leave garrisons at Deva and Isca Silurum, it may be gathered that the tribes occupying the hill country were not so thoroughly subdued as to cease to be dangerous. Although the idea entertained by Ostorius of making a frontier on land towards the west had thus been abandoned, it was still necessary to provide a frontier towards the north. Even before Agricola arrived it had been shown to be impossible to stop at the line between the Mersey and the Humber. Beyond that line was the territory of the Brigantes, who had for some time occupied the position which in the first years of the Roman conquest had been occupied by the Iceni--that is to say, they were in friendly dependence upon Rome, without being actually controlled by Roman authority. Before Agricola's coming disputes had arisen with them, and Roman soldiers had occupied their territory. Agricola finished the work of conquest. He now governed the whole of the country as far north as to the Solway and the Tyne, and he made Eboracum, the name of which changed in course of time into York, the centre of Roman power in the northern districts. A garrison was established there to watch for any danger which might come from the extreme north, as the garrisons of Deva and Isca Silurum watched for dangers which might come from the west.